Migration is to evolution as breathing  (respiration or transpiration) is to life.  Everything has existed in something else for that life’s existence.  An, then there was birth.

Immigration is simply  a milestone in migration.  Migration has always existed. Likewise, immigration always existed, and always will. Trust me on this one:  Animals copulate. Animals migrate. Or, they die.

If you oppose immigration, you are simply opposing life. “Hello!”  You get better odd playing the Super-duper lotto. Good luck with that!

The answer is “one.”